| Date & Time: | Sep 30 2022, from 25:46 to 26:56 JST(+0900) |
| Composed 8 shots with 10 minutes exposed |
| Optical: | TAKAHASHI 16cm(6.3") epsilon (f=530mm, F3.3) |
| with IDAS LPS-D1 Light-pollution suppression filter |
| Auto-guided with TAKAHASHI JP Equatorial+SBIG STV |
| CMOS Camera: | ZWO ASI2600MC Pro (Cooled temp.: -15°C) |
| Location: | Ooizumi, Hokuto city, Yamanashi pref. |
| Sh2-151 / Diffused Nebula, type 5 E |
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| R.A. | 23h 03m 03.2s (2000.0) |
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| Dec. | +57°04' 18" (2000.0) |
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| Apparent Size | 20.0' |
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| Real Size | 110 light yrs. |
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| Magnitude | - |
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| Distance | 19000 light yrs. |
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| Other IDs | LBN 517 |
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Sh2-151 is a faint Hα nebula in the westernmost part of Cassiopeia, near the boundary with Cepheus.
Among many red nebulae scattered around this region, the nebula is not very conspicuous.
It has a shape that extends north and south, and it takes about 20 arc minutes to cross.
You can also see very faint and bluish gas components around a 5th magnitude star located 25 minutes west of Sh2-151.
The distance to this nebula has been estimated to be approx. 19,000 light-years, although there are variations depending on the literature.
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